Integrated digital temperature transmitter

Temperature Gauge Series>>SBWR/ZIntegrated digital temperature transmitter：

1、 Instrument Overview:
Integrated digital temperature transmitterUsed in conjunction with industrial thermocouples and thermistors, it adopts a two-wire transmission method (two wires serve as a common transmission line for power input and signal output). Temperature transmitter is an updated product for temperature measurement and control in modern industrial sites and research institutes. It is a product of distributed systems and digital bus systems.
2、 Measurement principle:
Integrated digital temperature transmitterThermocouples or thermal resistance sensors convert the measured temperature into electrical signals, which are then sent to the input network of the transmitter. This network includes relevant circuits such as zeroing and thermocouple compensation. The zero adjusted signal is input to an operational amplifier for signal amplification. The amplified signal is then processed by a V/I converter and output as a 4-20mA DC current; The other path is processed by an A/D converter and displayed in the header. There are two types of linearization circuits for transmitters, both of which use feedback methods. For thermistor sensors, calibrate using positive feedback method, and for thermocouple sensors, calibrate using multi segment line approximation method. There are two display modes. The temperature transmitter for LCD display outputs using a two-wire system, while the temperature transmitter for LED display outputs using a three wire system.
3、 Applicable occasions:
The temperature transmitter can be directly installed in the junction box of thermocouples and thermal resistors to form an integrated structure. As a new generation of temperature measuring instrument, it can be widely used in industrial sectors such as metallurgy, petroleum, chemical, power, light industry, textile, food, national defense, and scientific research.
4、 Performance characteristics:
1. Adopting silicone rubber or epoxy resin sealing structure, it is shock resistant, moisture resistant, and suitable for installation and use in harsh on-site environments.
2. Installed on-site in junction boxes for thermocouples and thermal resistors, it directly outputs 4-20mA and 0-10mA output signals. This not only saves expensive expenses. Compensating for wire costs and improving the resistance of signals during long-distance transmission;
3. Thermocouple transmitters have automatic compensation function for cold junction temperature;
4. High precision, low power consumption, wide temperature range for use, stable and reliable operation;
5. Widely applicable, it can form an integrated on-site installation structure with thermocouples and thermistors, and can also be installed as a functional module in detection equipment and instrument panels for use;
6. It can communicate with the upper computer through a HART modem or with handheld devices and PCs to determine the model, scale, and range of the transmitter. Perform remote information management, configuration, variable monitoring, calibration, and maintenance functions;
7. The display direction of the transmitter can be adjusted according to the actual needs of the user, and the temperature of the medium measured by the transmitter, changes in sensor values, output current, and percentage can be displayed.
5、 Technical indicators:
1. Input signal: Thermocouples: K, E, J, B, S, T, N. Thermal resistance: Pt100, Cu50, Cu100 (three wire system, four wire system). The input signal of the intelligent temperature transmitter can be set arbitrarily through a handheld device and a PC;
2. Output signal: Output a 4-20mA DC signal within the range of measurement, which is linear with the input signal of the thermocouple or thermistor or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal and superimposes it with communication in accordance with the HART standard protocol; Isolation type temperature transmitter: Input and output are isolated, with an isolation voltage of 500V, which increases the resistance to common mode * force and is more suitable for networking with computers;
3. Basic error: 0.5% FS, 0.2% FS, intelligent 0.2% FS;
4. Wiring methods: two-wire system, three wire system, four wire system;
5. Display mode: Four digit LCD displays the on-site temperature, and the intelligent four digit LCD can be set through a PC or handheld device to display any of the parameters such as on-site temperature, sensor value, output current, and percentage;
6. Working voltage: Ordinary model 12V-35V, intelligent model 12V-45V, rated working voltage is 24V
7. Allowable load resistance: 500 Ω (24VDC power supply); The maximum load resistance R (max) is 50 (Vmin-12). For example, at a rated operating voltage of 24V, the load resistance can be selected and used within the range of 0-600 Ω.
8. Work environment:
a: Environmental temperature -25-+80 ℃ (conventional type); -25-+70 ℃ (digital type); -25+75 ℃ (intelligent type).
b: Relative humidity: 5% -95%;
c: Mechanical vibration f ≤ 50Hz, amplitude ≤ 0.15mm;
d: No corrosive gas or similar environment;
9. Environmental impact coefficient: δ ≤ 0.05%/℃.
6、 Verification method:
1. Equipment requirements: one digital voltmeter;
2. Connect the wires according to the system connection method;
3. According to the sensor and range indicated on the transmitter nameplate, input the corresponding resistance values to output 1V and 5V (the zero potentiometer and full potentiometer can be adjusted separately);
4. Input the resistance values at the ten equal points of the measurement range and check if the temperature outputs meet the accuracy range;
5. Tested according to the technical specifications in the manual, it should meet the technical requirements.
7、 Attention:
1. When used in explosive hazardous areas, please pay attention to explosion-proof signs and protection levels;
2. The installation environment must be within -20-+70 ℃. When the ambient temperature is too high, the SBWZ/R signal converter and display module can be installed separately from the thermistor or thermocouple. Our factory is equipped with explosion-proof boxes for separate installation of transmitters.
3. Before powering on, please carefully check the positive and negative polarity of the power supply. Do not connect it incorrectly, otherwise it may cause unknown consequences.
4. The SBW signal converter module is encapsulated and cured with epoxy resin to enhance its shock resistance and prevent moisture, corrosion, and dampness.
5. The temperature transmitter needs to be calibrated after six months of use.

8、 Measurement range:

9、 Selection List:

10、 Design and ordering instructions:
1. Special specification orders are determined through mutual consultation between both parties.
2. Protective tubes made of corresponding materials can be provided according to user needs. Such as corundum tube or high alumina protective tube.
3. If there are any other special requirements, please indicate them when placing an order.
After-sales service
1. The instrument series products sold by Zhongwei ensure the sale of products and spare parts at the same price within two years, and provide corresponding free of charge according to the requirements of the demand.
2. If there are any quality problems with the products provided by our company within one year (excluding vulnerable parts or accessories), we will be responsible for free repairs and provide free skill training for the employees of the demand side.
3. Due to quality issues with the products provided by our company, after verification by our technical department, we will dispatch professional technicians to the site to handle the problem until customer satisfaction is achieved.
4. Outside the warranty period, the product will be returned to the company for repair or sent to the user for repair.
5. Join hands with Zhongwei Measurement and Control to create a better future! Welcome to your visit!